One person shot in 2nd night of unrest in Milwaukee

At least one person was shot and an officer was injured in Milwaukee late Sunday during a second night of violent protests over a fatal police shooting.

More than 100 people holding candles and paper signs reading "BlackLivesMatter" had gathered early Sunday night at a local park, then marched to the site of the shooting. The peaceful protest was later disrupted by skirmishes.

Police said angry crowds pelted officers with rocks, concrete and debris after authorities declared the gathering in the Sherman Park neighborhood of Milwaukee an unlawful assembly and threatened arrests.

Photos from the scene:

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A police car with broken windows is seen in a photograph released by the Milwaukee Police Department after disturbances following the police shooting of a man in Milwaukee, Wisconsin, U.S. August 13, 2016. Milwaukee Police/Handout via REUTERS ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. TPX IMAGES OF THE DAY

An overturned bus shelter lies on the ground after dozens of people protested following the fatal shooting of a man in Milwaukee, Saturday, Aug. 13, 2016. A crowd of protesters skirmished with police Saturday night in the Milwaukee neighborhood where an officer shot and killed a man after a traffic stop and foot chase earlier in the day, setting fire to a police car and torching a gas station. (AP Photo/Gretchen Ehlke)

Authorities respond near a burning gas station as dozens of people protest following the fatal shooting of a man in Milwaukee, Saturday, Aug. 13, 2016. A crowd of protesters skirmished with police Saturday night in the Milwaukee neighborhood where an officer shot and killed a man after a traffic stop and foot chase earlier in the day, setting fire to a police car and torching a gas station. (AP Photo/Gretchen Ehlke)

Police advance toward protesters during disturbances following the police shooting of a man in Milwaukee, Wisconsin, U.S. August 14, 2016. REUTERS/Aaron P. Bernstein

MILWAUKEE, WISCONSIN, USA - AUGUST 14: Police officers try to keep away protesters from the area as they construct barricade near the damaged gas station during a protest held for Sylville Smith, who was shot and killed by a police officer as he reportedly attempted to flee after he was pulled over by police during a traffic stop Saturday afternoon, in Wisconsin, Milwaukee, USA on August 14, 2016. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)

MILWAUKEE, WISCONSIN, USA - AUGUST 14: Police officers try to keep away protesters from the area as they construct barricade near the damaged gas station during a protest held for Sylville Smith, who was shot and killed by a police officer as he reportedly attempted to flee after he was pulled over by police during a traffic stop Saturday afternoon, in Wisconsin, Milwaukee, USA on August 14, 2016. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)

MILWAUKEE, WISCONSIN, USA - AUGUST 14: A protester stands against police officers during a protest held for Sylville Smith, who was shot and killed by a police officer as he reportedly attempted to flee after he was pulled over by police during a traffic stop Saturday afternoon, in Wisconsin, Milwaukee, USA on August 14, 2016. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police officers stand guard at the District 7 police station as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Crowds takes to the streets near the District 7 police station, protesting for a second night after an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Crowds gather near the BP gas station that was burned, protesting for a second night after an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police in riot gear line up as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Men throw rocks as an angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. There was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police in riot gear line up as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police take a man to a hospital after he was shot in the neck as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police take a man to a hospital after he was shot in the neck as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police take a man to a hospital after he was shot in the neck as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

MILWAUKEE, WI - AUGUST 14: Police in riot gear line up as angry crowds took to the streets for a second night to protest an officer-involved killing August 14, 2016 in Milwaukee, Wisconsin. Protestors threw rocks and there was gunfire in the crowd as hundreds of people confronted police after an officer shot and killed a fleeing armed man earlier in the day. (Photo by Darren Hauck/Getty Images)

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One injured cop was taken to the hospital after a rock broke the windshield of his squad car, according to the force.

Officer taken to hospital for injury after thrown rock breaks windshield of squad near Sherman & Burleigh. pic.twitter.com/At5HDBOXHm

The violence escalated after 11 p.m. local time (12 a.m. ET) when gunfire was reported. Police said officers used an armored vehicle to rush one shooting victim to the hospital. The 18-year-old victim was being treated for serious injuries, according to NBC affiliate WTMJ.

WTMJ reported that while most of the protesters had dispersed by around 1 a.m. local time, isolated incidents continued. A car was set ablaze and more shots were reported, according to police.

Debris continues to be thrown at officers attempting to disperse disorderly crowd.

Officials have been appealing for calm since the violence erupted Saturday night in wake of the fatal police shooting of Sylville K. Smith, 23. Businesses were burned, a cop car was torched and property destroyed.

Police have said Smith — who was black — was armed with a handgun and fleeing a traffic stop on foot when he was killed by a 24-year-old African-American officer.

Body camera video that hasn't been released shows that there was a "credible threat" to the officer, according to Milwaukee Police Chief Edward A. Flynn.

At one point Smith — who authorities said had a "lengthy" arrest record — turned toward the officer with the gun in his hand, Flynn said. Authorities said Smith's gun held 23 rounds.

The state is investigating the shooting.

The officer has been placed on administrative duty pending an investigation. He has also left town in light of threats against him and other police officers, according to Flynn.

Smith's sister told The Associated Press that the family wants prosecutors to charge the officer who shot him.

Kimberly Neal, 24, spoke as supporters surrounded her at the vigil as she held a bouquet of blue balloons.

When asked about the violence, Neal said: "People stuck together and they are trying to stand up," for their rights.

The National Guard had been activated and put on standby Sunday.

Smith's death comes amid nationwide tensions over police use of force — which has spurred protests but also deadly violence against officers.

The Milwaukee Police Association hit back at the suggestion race may have played an issue in Smith's shooting and condemned the riots.

"Leadership must denounce violent riotous behavior! There can be no appropriateness in rationalizing terrorist-like actions," it said in a statement. "The thugs that caused this are certainly terrorists and must be held accountable."